Class: Dymos::Model

Inherits:
Object
  • Object
show all
Includes:
ActiveModel::Callbacks, ActiveModel::Dirty, ActiveModel::Model, Persistence
Defined in:
lib/dymos/model.rb

Class Attribute Summary collapse

Instance Attribute Summary collapse

Attributes included from Persistence

#new_record

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Persistence

#delete, #destroyed?, #new_record?, #persisted?, #save, #save!, #update, #update!

Constructor Details

#initialize(params = {}) ⇒ Model

Returns a new instance of Model.



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# File 'lib/dymos/model.rb', line 14

def initialize(params={})
  @attributes={}
  send :attributes=, params, true
  super
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object 



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# File 'lib/dymos/model.rb', line 37

def method_missing(name, *args, &block)
  methods ||= ::Dymos::Query::UpdateItem.instance_methods(false)+
    ::Dymos::Query::PutItem.instance_methods(false)+
    ::Dymos::Query::DeleteItem.instance_methods(false)
  if methods.include? name
    @query||={}
    @query[name]=args
    self
  else
    super
  end
end

Class Attribute Details

.last_execute_query ⇒ Object

Returns the value of attribute last_execute_query.



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# File 'lib/dymos/model.rb', line 21

def last_execute_query
  @last_execute_query
end

Instance Attribute Details

#last_execute_query ⇒ Object

Returns the value of attribute last_execute_query.



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# File 'lib/dymos/model.rb', line 10

def last_execute_query
  @last_execute_query
end

#metadata ⇒ Object

Returns the value of attribute metadata.



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# File 'lib/dymos/model.rb', line 10

def metadata
  @metadata
end

Class Method Details

._execute(builder) ⇒ Object 



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# File 'lib/dymos/model.rb', line 154

def self._execute(builder)
  query = builder.build
  response = ::Dymos::Client.new.command builder.command, query
  @last_execute_query = {command: builder.command, query: query}
  to_model(class_name, response)
end

.all ⇒ Object 



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# File 'lib/dymos/model.rb', line 127

def self.all
  if @query.present? && (@query.keys & [:conditions, :add_condition, :where]).present?
    builder = ::Dymos::Query::Query.new.name(table_name)
  else
    builder = ::Dymos::Query::Scan.new.name(table_name)
  end
  @query.each do |k, v|
    builder.send k, *v
  end if @query.present?
  @query={}
  _execute(builder)
end

.class_name ⇒ String

Returns:

  • (String) 


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# File 'lib/dymos/model.rb', line 182

def self.class_name
  self.name
end

.describe ⇒ Object 



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# File 'lib/dymos/model.rb', line 169

def self.describe
  builder=::Dymos::Query::Describe.new.name(table_name)
  ::Dymos::Client.new.command :describe_table, builder.build
end

.field(attr, type, default: nil, desc: nil) ⇒ Object 



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# File 'lib/dymos/model.rb', line 50

def self.field(attr, type, default: nil, desc: nil)
  fail StandardError('attribute name is invalid') if attr =~ /[\!\?]$/
  fail StandardError('require "default" option') if (type == :bool && default.nil?)

  @fields ||= {}
  @fields[attr]={
    type: type,
    default: default,
    desc:desc
  }
  define_attribute_methods attr

  define_model_callbacks attr
  define_method(attr) { |raw=false|
    run_callbacks attr do
      val = read_attribute(attr) || default
      return val if raw || !val.present?
      case type
        when :bool
          to_b(val)
        when :time
          Time.parse val
        when :integer
          val.to_i
        else
          val
      end
    end

  }
  define_singleton_method("#{attr}_type") { type }
  define_method("#{attr}_type") { type }
  define_singleton_method("#{attr}_desc") { desc }
  define_method("#{attr}_desc") { desc }
  define_method("#{attr}?") do
    val = self.send attr
    if type == :bool
      val
    else
      !val.nil?
    end
  end

  define_model_callbacks :"set_#{attr}"
  define_method("#{attr}=") do |value, initialize=false|
    run_callbacks :"set_#{attr}" do
      value = value.iso8601 if self.class.fields.include?(attr) && value.is_a?(Time)
      write_attribute(attr, value, initialize)
    end
  end
end

.fields ⇒ Object 



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# File 'lib/dymos/model.rb', line 102

def self.fields
  @fields
end

.find(key1, key2 = nil) ⇒ Object 



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# File 'lib/dymos/model.rb', line 145

def self.find(key1, key2=nil)
  indexes = key_scheme
  keys={}
  keys[indexes.first[:attribute_name].to_sym] = key1
  keys[indexes.last[:attribute_name].to_sym] = key2 if indexes.size > 1

  builder = ::Dymos::Query::GetItem.new.name(table_name).key(keys)
  _execute(builder)
end

.key_scheme ⇒ Object 



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# File 'lib/dymos/model.rb', line 161

def self.key_scheme
  @key_scheme ||= describe[:table][:key_schema]
end

.method_missing(name, *args, &block) ⇒ Object 



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# File 'lib/dymos/model.rb', line 23

def method_missing(name, *args, &block)
  methods ||= ::Dymos::Query::Query.instance_methods(false)+
    ::Dymos::Query::GetItem.instance_methods(false)+
    ::Dymos::Query::Scan.instance_methods(false)
  if methods.include? name
    @query||={}
    @query[name]=args
    self
  else
    super
  end
end

.one ⇒ Object 



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# File 'lib/dymos/model.rb', line 140

def self.one
  @query[:limit] = 1
  self.all.first
end

.table(name) ⇒ Object 



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# File 'lib/dymos/model.rb', line 106

def self.table(name)
  define_singleton_method('table_name') { name }
  define_method('table_name') { name }
end

Instance Method Details

#attributes(raw = false) ⇒ Object 



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# File 'lib/dymos/model.rb', line 119

def attributes(raw=false)
  attrs = {}
  self.class.fields.keys.each do |name|
    attrs[name] = send "#{name}", raw if respond_to? "#{name}"
  end
  attrs
end

#attributes=(attributes = {}, initialize = false) ⇒ Object 



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# File 'lib/dymos/model.rb', line 111

def attributes=(attributes = {}, initialize = false)
  if attributes
    attributes.each do |attr, value|
      send("#{attr}=", value, initialize) if respond_to? "#{attr}="
    end
  end
end

#class_name ⇒ String

Returns:

  • (String) 


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# File 'lib/dymos/model.rb', line 187

def class_name
  self.class.name
end

#indexes ⇒ Object 



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# File 'lib/dymos/model.rb', line 174

def indexes
  scheme = self.class.key_scheme.map do |scheme|
    [scheme[:attribute_name], send(scheme[:attribute_name])]
  end
  scheme.to_h
end

#reload! ⇒ Object 



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# File 'lib/dymos/model.rb', line 165

def reload!
  reset_changes
end